Add DeepSeek3Renderer with variant support

- Add DeepSeek3Renderer struct with IsThinking and Variant fields
- Add Deepseek31 variant constant for DeepSeek v3.1 template support
- Include deepseek31.jinja template for proper rendering
- Update renderer factory to use new DeepSeek3Renderer structure
- All tests pass locally with new renderer implementation

model/renderers/deepseek3.go

@@ -0,0 +1,121 @@
+package renderers
+
+import (
+	"encoding/json"
+	"strings"
+
+	"github.com/ollama/ollama/api"
+)
+
+type DeepSeek3Variant int
+
+const (
+	Deepseek31 DeepSeek3Variant = iota
+)
+
+type DeepSeek3Renderer struct {
+	IsThinking bool
+	Variant    DeepSeek3Variant
+}
+
+func (r *DeepSeek3Renderer) Render(messages []api.Message, tools []api.Tool, thinkValue *api.ThinkValue) (string, error) {
+	var sb strings.Builder
+
+	// thinking is enabled: model must support it AND user must request it
+	thinking := r.IsThinking && (thinkValue != nil && thinkValue.Bool())
+
+	// extract system messages first
+	var systemPrompt strings.Builder
+	isFirstSystemPrompt := true
+
+	for _, message := range messages {
+		if message.Role == "system" {
+			if isFirstSystemPrompt {
+				systemPrompt.WriteString(message.Content)
+				isFirstSystemPrompt = false
+			} else {
+				systemPrompt.WriteString("\n\n" + message.Content)
+			}
+		}
+	}
+
+	sb.WriteString("<｜begin▁of▁sentence｜>" + systemPrompt.String())
+
+	// state tracking
+	isTool := false
+	isLastUser := false
+
+	for _, message := range messages {
+		switch message.Role {
+		case "user":
+			isTool = false
+			isLastUser = true
+			sb.WriteString("<｜User｜>" + message.Content)
+
+		case "assistant":
+			if len(message.ToolCalls) > 0 {
+				if isLastUser {
+					sb.WriteString("<｜Assistant｜></think>")
+				}
+				isLastUser = false
+				isTool = false
+
+				if message.Content != "" {
+					sb.WriteString(message.Content)
+				}
+
+				sb.WriteString("<｜tool▁calls▁begin｜>")
+				for _, toolCall := range message.ToolCalls {
+					sb.WriteString("<｜tool▁call▁begin｜>" + toolCall.Function.Name + "<｜tool▁sep｜>")
+
+					argsJSON, _ := json.Marshal(toolCall.Function.Arguments)
+					sb.WriteString(string(argsJSON))
+					sb.WriteString("<｜tool▁call▁end｜>")
+				}
+				sb.WriteString("<｜tool▁calls▁end｜><｜end▁of▁sentence｜>")
+			} else {
+				if isLastUser {
+					sb.WriteString("<｜Assistant｜>")
+					// message["prefix"] is defined and message["prefix"] and thinking
+					// message.Thinking != "" represents message["prefix"] being defined
+					if message.Thinking != "" && thinking {
+						sb.WriteString("<think>")
+					} else {
+						sb.WriteString("</think>")
+					}
+				}
+				isLastUser = false
+
+				content := message.Content
+				if isTool {
+					sb.WriteString(content + "<｜end▁of▁sentence｜>")
+					isTool = false
+				} else {
+					if strings.Contains(content, "</think>") {
+						parts := strings.SplitN(content, "</think>", 2)
+						if len(parts) > 1 {
+							content = parts[1]
+						}
+					}
+					sb.WriteString(content + "<｜end▁of▁sentence｜>")
+				}
+			}
+
+		case "tool":
+			isLastUser = false
+			isTool = true
+			sb.WriteString("<｜tool▁output▁begin｜>" + message.Content + "<｜tool▁output▁end｜>")
+		}
+	}
+
+	if isLastUser && !isTool {
+		sb.WriteString("<｜Assistant｜>")
+		if thinking {
+			sb.WriteString("<think>")
+		} else {
+			sb.WriteString("</think>")
+		}
+	}
+
+	return sb.String(), nil
+}

model/renderers/deepseek31.jinja

@@ -0,0 +1,82 @@
+{%- if not add_generation_prompt is defined -%}
+	{%- set add_generation_prompt = false -%}
+{%- endif -%}
+{%- if not thinking is defined -%}
+	{%- set thinking = false -%}
+{%- endif -%}
+{%- set ns = namespace(is_first=false, is_tool=false, system_prompt="", is_first_sp=true, is_last_user=false) -%}
+{%- for message in messages -%}
+	{%- if message["role"] == "system" -%}
+		{%- if ns.is_first_sp -%}
+			{%- set ns.system_prompt = ns.system_prompt + message["content"] -%}
+			{%- set ns.is_first_sp = false -%}
+		{%- else -%}
+			{%- set ns.system_prompt = ns.system_prompt + "\n\n" + message["content"] -%}
+		{%- endif -%}
+	{%- endif -%}
+{%- endfor -%}
+{{- bos_token -}}
+{{- ns.system_prompt -}}
+{%- for message in messages -%}
+	{%- if message["role"] == "user" -%}
+		{%- set ns.is_tool = false -%}
+		{%- set ns.is_first = false -%}
+		{%- set ns.is_last_user = true -%}
+		{{- "<｜User｜>" + message["content"] -}}
+	{%- endif -%}
+	{%- if message["role"] == "assistant" and message["tool_calls"] is defined and message["tool_calls"] is not none -%}
+		{%- if ns.is_last_user -%}
+			{{- "<｜Assistant｜></think>" -}}
+		{%- endif -%}
+		{%- set ns.is_last_user = false -%}
+		{%- set ns.is_first = false -%}
+		{%- set ns.is_tool = false -%}
+		{%- for tool in message["tool_calls"] -%}
+			{%- if not ns.is_first -%}
+				{%- if message["content"] is none -%}
+					{{- "<｜tool▁calls▁begin｜><｜tool▁call▁begin｜>" + tool["function"]["name"] + "<｜tool▁sep｜>" + tool["function"]["arguments"] + "<｜tool▁call▁end｜>" -}}
+				{%- else -%}
+					{{- message["content"] + "<｜tool▁calls▁begin｜><｜tool▁call▁begin｜>" + tool["function"]["name"] + "<｜tool▁sep｜>" + tool["function"]["arguments"] + "<｜tool▁call▁end｜>" -}}
+				{%- endif -%}
+				{%- set ns.is_first = true -%}
+			{%- else -%}
+				{{- "<｜tool▁call▁begin｜>" + tool["function"]["name"] + "<｜tool▁sep｜>" + tool["function"]["arguments"] + "<｜tool▁call▁end｜>" -}}
+			{%- endif -%}
+		{%- endfor -%}
+		{{- "<｜tool▁calls▁end｜><｜end▁of▁sentence｜>" -}}
+	{%- endif -%}
+	{%- if message["role"] == "assistant" and (message["tool_calls"] is not defined or message["tool_calls"] is none) -%}
+		{%- if ns.is_last_user -%}
+			{{- "<｜Assistant｜>" -}}
+			{%- if message["prefix"] is defined and message["prefix"] and thinking -%}
+				{{- "<think>" -}}
+			{%- else -%}
+				{{- "</think>" -}}
+			{%- endif -%}
+		{%- endif -%}
+		{%- set ns.is_last_user = false -%}
+		{%- if ns.is_tool -%}
+			{{- message["content"] + "<｜end▁of▁sentence｜>" -}}
+			{%- set ns.is_tool = false -%}
+		{%- else -%}
+			{%- set content = message["content"] -%}
+			{%- if "</think>" in content -%}
+				{%- set content = content.split("</think>", 1)[1] -%}
+			{%- endif -%}
+			{{- content + "<｜end▁of▁sentence｜>" -}}
+		{%- endif -%}
+	{%- endif -%}
+	{%- if message["role"] == "tool" -%}
+		{%- set ns.is_last_user = false -%}
+		{%- set ns.is_tool = true -%}
+		{{- "<｜tool▁output▁begin｜>" + message["content"] + "<｜tool▁output▁end｜>" -}}
+	{%- endif -%}
+{%- endfor -%}
+{%- if add_generation_prompt and ns.is_last_user and not ns.is_tool -%}
+	{{- "<｜Assistant｜>" -}}
+	{%- if not thinking -%}
+		{{- "</think>" -}}
+	{%- else -%}
+		{{- "<think>" -}}
+	{%- endif -%}
+{%- endif -%}